An Idealized 3D Model of Interfacial Instability of Aeolian Bedform

doi:10.3390/app11198956

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	An Idealized 3D Model of Interfacial Instability of Aeolian Bedform
	Wang, Peng 2; Zhang, Jie 1; Huang, Ning 1
刊名	APPLIED SCIENCES-BASEL
	2021-10
卷号	11 期号:19
关键词	aeolian transport impact-induced gravity flow aeolian ripples wind erosion instability
DOI	10.3390/app11198956
英文摘要	An idealized morphodynamic model is constructed for formation of the aeolian sand ripples from small bottom perturbations of a two-dimensional sand bed. The main goal of the analysis is to evaluate the influence of the gravity flow (including impact-induced gravity flow in the reptation flux and topography-induced gravity flow in the creep flux) on the formation of the aeolian sand ripples and to clarify the relative contribution of various factors to the bed instability. A 3D linear stability analysis reveals that gravity flow appreciably affects the dynamics behaviors of aeolian sand ripples, which decreases the growth rate of sand ripples, tends to stabilize the sand bed, and leads to longer wavelength. We found that the competition between the destabilizing effect of reptation flow and the stabilizing effects of gravity flow leads to pattern selection. The along-crest diffusion of topography driven by impact and gravity is beneficial to the transverse stability of sand ripples, producing sand ripples with straighter and more continuous crests. For moderate values of D, the most unstable mode has zero value of the transverse wavenumber (k(y) = 0), thus corresponding to aeolian ripples with crests perpendicular to the wind. Moreover, when the impact angle is 9-16 & DEG;, it has little effect on the characteristics of sand ripples for the initial stage of ripple development. For every increase of the impact angle by 1 & DEG;, the initial wavelength only increases by about 1.5%. In conclusion, the influence of the gravity flow on the dynamics of sand ripples formation stage cannot be neglected.
WOS研究方向	Chemistry ; Engineering ; Materials Science ; Physics
语种	英语
出版者	MDPI
WOS记录号	WOS:000722630000001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150085]
专题	理学院机电工程学院
作者单位	1.Lanzhou Univ, Coll Civil Engn & Mech, Key Lab Mech Disaster & Environm Western China, Lanzhou 730000, Peoples R China 2.Lanzhou Univ Technol, Sch Sci, Lanzhou 730050, Peoples R China;
推荐引用方式 GB/T 7714	Wang, Peng,Zhang, Jie,Huang, Ning. An Idealized 3D Model of Interfacial Instability of Aeolian Bedform[J]. APPLIED SCIENCES-BASEL,2021,11(19).
APA	Wang, Peng,Zhang, Jie,&Huang, Ning.(2021).An Idealized 3D Model of Interfacial Instability of Aeolian Bedform.APPLIED SCIENCES-BASEL,11(19).
MLA	Wang, Peng,et al."An Idealized 3D Model of Interfacial Instability of Aeolian Bedform".APPLIED SCIENCES-BASEL 11.19(2021).